564 TERTIARY INSECTS OF NORTH AMERICA. 



Cyrtidse, The wing is very slender and all the cells unusually elongated, 

 which also gives it a unique appearance. 



STENOCINCLIS ANOMALA. 



PL 9, Fig. 10. 

 Stenocinclis anomala Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., IV, 751-752 (1878). 



This species is represented by a single fragment of a wing, which I 

 found in the Green River shales. Nearly all the neuration is preserved ; 

 but the posterior margin is absent and the length of the cells which border 

 upon it can not be accurately determined. The insect was evidently small, 

 with a long and slender wing. The auxiliary vein terminates slightly 

 beyond the middle of the costal margin ; the first longitudinal vein runs up 

 toward the margin where the auxiliary vein terminates, and follows along 

 next the edge far toward the tip, as usual in this group ; the second longi- 

 tudinal vein originates from the first a little way before the middle of the 

 'wing, and with an exceedingly gentle sinuous curve, turning upward apic- 

 ally, terminates a little way beyond the first longitudinal vein ; the third 

 longitudinal vein originates from the first as far before the origin of the 

 second longitudinal vein as the distance apart of the tips of the first and 

 second longitudinal veins, and, running at first parallel and almost as close 

 to it as the first longitudinal vein to the apical half of the costal margin, 

 but distinctly separate throughout, it diverges slightly from it in the middle 

 of the wing and terminates at the lower part of the apex of the wing, curv- 

 ing downward more strongly toward the margin ; at the middle of the 

 divergent part of its course, which is very regular, it emits abruptly a supe- 

 rior branch, which afterward curves outward and runs in a very slightly 

 sinuous course to the margin, curving upward as it approaches it, The 

 fourth longitudinal vein, is seen to start from the root of the wing, and runs 

 in a straight course until it reaches a point just below the origin of the sec- 

 ond longitudinal vein, where it is connected with the vein below by the 

 anterior b;isal transverse vein, and then bends a little downward, running 

 nearly parallel to the third longitudinal vein, but continuing in a straighter 

 course terminates on the margin at nearly the same point; these two veins 

 are connected by the small transverse vein midway between the anterior 

 basal transverse; vein and the forking of the third longitudinal vein; the 

 fourth longitudinal vein is connected by the posterior transverse vein 



